[class^="icon-"] {
    display: inline-block;
    width: 16px;
    height: 16px;
    background-size: contain;
    vertical-align: middle;
    margin-right: 5px;
}

.icon-success {
    background: url(../assets/images/icon-success.png) center center no-repeat;
}

.icon-error {
    background: url(../assets/images/icon-error.png) center center no-repeat;
}

.icon-reject {
    background: url(../assets/images/icon-reject.png) center center no-repeat;
}

.icon-warning {
    background: url(../assets/images/icon-warning.png) center center no-repeat;
}
